<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        div {
            width: 200px;
            height: 500px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }

    </style>
</head>
<body>

<div>
    <h2>登录图书管理系统</h2>
    <form action="/login" method="get" >
        <input id="username" name="username" type="text" placeholder="请输入用户名">
        <input id="password" name="password" type="password" placeholder="请输入密码">
        <input type="submit" value="登录">
    </form>
    <a href="#">注册</a>
</div>

</body>


</html>